' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)

Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()

' Perform other work.

' This blocks until the command completes.
Dim rowCount As Integer = _
    cmd.EndExecuteNonQuery( res )

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
);

IAsyncResult res = cmd.BeginExecuteNonQuery();

// Perform other work.

// This blocks until the command completes.
int rowCount = cmd.EndExecuteNonQuery( res );

' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)

Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()
While( !res.IsCompleted )
    ' Perform other work.
End While

' This blocks until the command completes.
Dim rowCount As Integer = _
    cmd.EndExecuteNonQuery( res )

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
);

IAsyncResult res = cmd.BeginExecuteNonQuery();
while( !res.IsCompleted ) {
    // Perform other work.
}

// This blocks until the command completes.
int rowCount = cmd.EndExecuteNonQuery( res );

' Visual Basic
Dim cmd As ULCommand = new ULCommand( _
    "UPDATE Departments" _
    + " SET DepartmentName = 'Engineering'" _
    + " WHERE DepartmentID=100", _
    conn _
)
Dim res As IAsyncResult res = _
    cmd.BeginExecuteNonQuery()

' Perform other work.

Dim wh As WaitHandle = res.AsyncWaitHandle
wh.WaitOne()
' This does not block because the command is finished.
Dim rowCount As Integer = _
  cmd.EndExecuteNonQuery( res )

// C#
ULCommand cmd = new ULCommand(
    "UPDATE Departments"
    + " SET DepartmentName = 'Engineering'"
    + " WHERE DepartmentID=100",
    conn
  );
IAsyncResult res = cmd.BeginExecuteNonQuery();
// perform other work
WaitHandle wh = res.AsyncWaitHandle;
wh.WaitOne();
// This does not block because the command is finished.
int rowCount = cmd.EndExecuteNonQuery( res );

' Visual Basic
Private Sub callbackFunction(ByVal ar As IAsyncResult)
    Dim cmd As ULCommand = _
        CType(ar.AsyncState, ULCommand)
    ' This won't block since the command has completed.
    Dim rowCount As Integer = _
        cmd.EndExecuteNonQuery( res )
End Sub

' Elsewhere in the code
Private Sub DoStuff()
    Dim cmd As ULCommand = new ULCommand( _
        "UPDATE Departments" _
        + " SET DepartmentName = 'Engineering'" _
        + " WHERE DepartmentID=100", _
        conn _
    )
    Dim res As IAsyncResult = _
        cmd.BeginExecuteNonQuery( _
        callbackFunction, cmd _
    )
    ' Perform other work.  The callback function
    ' is called when the command completes.
End Sub

// C#
private void callbackFunction( IAsyncResult ar )
{
    ULCommand cmd = (ULCommand) ar.AsyncState;
    // This won't block since the command has completed.
    int rowCount = cmd.EndExecuteNonQuery();
}

// Elsewhere in the code
private void DoStuff()
{
    ULCommand cmd = new ULCommand(
        "UPDATE Departments"
        + " SET DepartmentName = 'Engineering'"
        + " WHERE DepartmentID=100",
        conn
    );
    IAsyncResult res = cmd.BeginExecuteNonQuery(
        callbackFunction, cmd
    );
    // Perform other work.  The callback function
    // is called when the command completes.
}